If there had been changes made to the branch, git would have automatically tried to merge the changes in the bugfix-branch with the master branch.

Rarely, this can cause a merge conflict. In those cases, manually edit the files that conflict in the master branch, and then do a git commit -a to complete the merge. Git indicates the conflicting lines within the file that cannot be auto-merged.

Viewing the Change log

To view the change log for a given file in the local copy, run git log <FILENAME>.